Upon ingestion of a food particle by a protozoan, the food particle is in a(n) ________.
A. mitochondrion
B. endoplasmic reticulum
C. phagocytic vacuole
D. lysosome
Answer: C
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The first vertebrates appear in the fossil record during the
A. Cambrian Period. B. Proterozoic Era. C. Carboniferous Period. D. Triassic Period. E. Devonian Period
In this diagram of the heart, which of the
following choices correctly identifies A and B?
a. A is the AV node; B is the cardiac pacemaker. b. A is the SA node; B is the septum. c. A is the AV node; B is the SA node. d. A is the SA node; B is the AV node. e. A is the septum; B is the cardiac pacemaker.
Which of the following diseases is caused by the lack of a functional gene responsible for a specific enzyme?
(A) Down Syndrome (B) Tay-Sachs disease (C) Ricketts (D) Malaria
In DNA replication, primase is responsible for:
A. removal of a terminal nucleotide in a polynucleotide chain. B. connecting two fragments of DNA together. C. cutting DNA at a site?specific sequence. D. producing Okazaki fragments. E. synthesizing an RNA primer for DNA synthesis.